Never mind. After I bumped the thread, I realized that I and another member with a good camera and a disassembled sub-assembly had figured it out. To start with, some parts were not drawn anywhere near to the correct scale to match the rest of the parts in the drawing (like the cross-feed nut on the later 12"). Then some of the parts were out of sequence. And in the 1962 version (poorer original scan job than the 1950), a part or two were missing (notably the roll and taper pins). The 1950 version (better quality scan) is now correct up through at least 1962.
Sometime between 1962 and 1976, the spacers changed and one of the collars were deleted (at least according to the drawing). If anyone has either a 618 or a 101.21400 that they are certain was made after about 1965, a good photo and list of each part stacked up on the shaft and eccentrics might be helpful.
